S
M
T
W
T
F
S
30
69°
52°
31
69°
54°
1
68°
54°
2
70°
52°
3
69°
51°
4
68°
51°
5
69°
54°
6
67°
48°
7
69°
52°
8
69°
52°
9
70°
54°
10
71°
50°
11
69°
53°
12
67°
49°
13
70°
52°
14
70°
51°
15
69°
46°
16
65°
48°
17
68°
47°
18
68°
51°
19
69°
53°
20
69°
53°
21
68°
52°
22
69°
52°
23
67°
51°
24
66°
50°
25
66°
50°
26
65°
50°
27
65°
49°
28
66°
50°
29
66°
49°
30
66°
49°
1
Hist. Avg.
61°
48°
2
Hist. Avg.
61°
47°
3
Hist. Avg.
60°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Colchester
Colchester's September 2026 forecast shows daily high temperatures ranging from 65° to 71°, with overnight lows between 46° and 54°. The average high for September is 68° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Colchester. See also: October | November | December.
